Photosensitive negative-working tonable element
AssigneeE. I. Du Pont de Nemours and Company
InventorRoss A. Lee
Life of this patent
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Abstract
A photosensitive element which comprises a support bearing a layer of negative-working tonable photoimaging composition comprising at least one organic polymeric binder (a), a photosensitizer (b) which generates an acid upon absorption of actinic radiation, and at least one compound taken from the group of ##STR1## as defined, binder (a) being plasticized by the decomposition product of either compound (c) or (d) or the combination thereof. The photosensitive element is useful in making color proofs.
Claims6
A photosensitive element comprising a support bearing a layer of a negative-working tonable photoimaging composition which consists essentially of
- (a) at least one organic polymeric binder taken from the group consisting of polyvinylformal, polyvinylpyrrolidone, polyacrylate, cellulose acetate, polymethacrylate, and polyvinyl acetate;
- (b) a photosensitizer which upon absorption of actinic radiation is capable of generating an acid;
- and (c) at least one acetal compound of the formula ##STR4## wherein R.sub.2 is alkyl of 1 to 18 carbon atoms, furyl, substituted furyl, phenyl, substituted phenyl, naphthyl, and substituted naphthyl, R.sub.3 is alkyl of 1 to 18 carbon atoms, and OR.sub.3 when taken together form a 5, 6 or 7 membered ring,
- (d) a plasticizer in an amount of up to 20% by weight based on the total dry weight of the photoimaging composition;
- and
- (e) a polymeric anhydride in an amount up to 10% by weight based on the total weight of solids
- the polymeric binder (a) being plasticized by the decomposition product of the acetal compound.
Dependencies are inferred from the claim text.